SPECIAL EXERCISES ON TYPICAL FLOWERS 



205 



duced leaves (scales). If from the latter, determine whether 

 the bulb is solid (corm) or scaly. 



Study the stem, noting the smooth skin, rather prominent 

 nodes, and absence of annual rings (monocot) . Study the leaf. 

 Its veins are of what kind? What type? (See Ch. XII.) 



FIG. 90. Lilium superbum. 

 (Photographed by W. C. Barbour.) 



What is the number of floral circles? How many parts in 

 each? Draw the whole flower, one of each of its parts, a 

 plan of the flower, and a section to show insertion of parts. 



Make a cross section of the ovary, showing placentation. 

 Draw. From your observation, will the pod split (dehis- 

 cent) or remain closed (indehiscent) when it ripens? How 



